202 Section 2 Drafting Techniques and Skills
nonparallel lines. The procedure is the same
as that used for constructing a circle tangent
to a circle and a line. If you are drawing a
tangent arc, you can use the
Arc
command
and the
Center, Start, End
option. With this
option, arcs are drawn counterclockwise.
Use the following procedure.
1. Two nonparallel lines (Line AB and
Line CD) and the Radius R are given.
Refer to Figure 6-53A.
2. Enter the
Offset
command and offset
Line AB at a distance equal to Radius R.
Offset Line CD at the same distance.
The intersection of the offset lines is the
center of the required tangent circle or
arc. Refer to Point J in Figure 6-53B.
3. Enter the
Arc
command and enter the
Center
option. Select Point J as the center
r
point.
4. To specify the start point of the arc, enter
the Perpendicular object snap and select
Line AB. To specify the endpoint of the
arc, enter the Perpendicular object snap
and select Line CD. The required tangent
arc is drawn automatically. Refer to
Figure 6-53C.
Construct a
Circle or Arc
of a Given Radius Tangent
to Two Nonparallel Lines
CAD
Using a Compass
(Manual Procedure)
1. Two nonparallel lines (Line AB and
Line CD) and the Radius R are given,
Figure 6-53A.
2. At a distance equal to Radius R, con-
struct Lines EF and GH parallel to
Lines AB and CD, Figure 6-53B.
3. The intersection of the lines at Point J is
the center of the required tangent circle
or arc, Figure 6-53C.
An application of this construction is shown
in Figure 6-53D.
Using the Circle or Arc Command
(CAD Procedure)
The
Tangent, Tangent, Radius
option of
the
Circle
command can be used to draw a
circle of a given radius that is tangent to two
Figure 6-53. Constructing a circle or an arc of a given radius and tangent to two nonparallel lines. There are
many applications for this construction in drafting.
A
C
R
D
B
A
A
C
R
R
R
Application
10–
J
F
H
R
E
J
G
D
B
B C D